CPU: Save and restore the TPIDR_EL0 system register on every context switch.

Note that there's currently a dynarmic bug preventing this register from being written.
This commit is contained in:
Subv 2018-07-20 19:57:45 -05:00
parent f36affdbe3
commit d84eb9dac6
8 changed files with 39 additions and 0 deletions

View file

@ -104,6 +104,10 @@ public:
virtual void SetTlsAddress(VAddr address) = 0;
virtual u64 GetTPIDR_EL0() const = 0;
virtual void SetTPIDR_EL0(u64 value) = 0;
/**
* Saves the current CPU context
* @param ctx Thread context to save

View file

@ -196,6 +196,14 @@ void ARM_Dynarmic::SetTlsAddress(u64 address) {
cb->tpidrro_el0 = address;
}
u64 ARM_Dynarmic::GetTPIDR_EL0() const {
return cb->tpidr_el0;
}
void ARM_Dynarmic::SetTPIDR_EL0(u64 value) {
cb->tpidr_el0 = value;
}
void ARM_Dynarmic::SaveContext(ARM_Interface::ThreadContext& ctx) {
ctx.cpu_registers = jit->GetRegisters();
ctx.sp = jit->GetSP();

View file

@ -34,6 +34,8 @@ public:
void SetCPSR(u32 cpsr) override;
VAddr GetTlsAddress() const override;
void SetTlsAddress(VAddr address) override;
void SetTPIDR_EL0(u64 value) override;
u64 GetTPIDR_EL0() const override;
void SaveContext(ThreadContext& ctx) override;
void LoadContext(const ThreadContext& ctx) override;

View file

@ -169,6 +169,16 @@ void ARM_Unicorn::SetTlsAddress(VAddr base) {
CHECKED(uc_reg_write(uc, UC_ARM64_REG_TPIDRRO_EL0, &base));
}
u64 ARM_Unicorn::GetTPIDR_EL0() const {
u64 value{};
CHECKED(uc_reg_read(uc, UC_ARM64_REG_TPIDR_EL0, &value));
return value;
}
void ARM_Unicorn::SetTPIDR_EL0(u64 value) {
CHECKED(uc_reg_write(uc, UC_ARM64_REG_TPIDR_EL0, &value));
}
void ARM_Unicorn::Run() {
if (GDBStub::IsServerEnabled()) {
ExecuteInstructions(std::max(4000000, 0));

View file

@ -28,6 +28,8 @@ public:
void SetCPSR(u32 cpsr) override;
VAddr GetTlsAddress() const override;
void SetTlsAddress(VAddr address) override;
void SetTPIDR_EL0(u64 value) override;
u64 GetTPIDR_EL0() const override;
void SaveContext(ThreadContext& ctx) override;
void LoadContext(const ThreadContext& ctx) override;
void PrepareReschedule() override;

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@ -56,6 +56,8 @@ void Scheduler::SwitchContext(Thread* new_thread) {
if (previous_thread) {
previous_thread->last_running_ticks = CoreTiming::GetTicks();
cpu_core->SaveContext(previous_thread->context);
// Save the TPIDR_EL0 system register in case it was modified.
previous_thread->tpidr_el0 = cpu_core->GetTPIDR_EL0();
if (previous_thread->status == THREADSTATUS_RUNNING) {
// This is only the case when a reschedule is triggered without the current thread
@ -87,6 +89,7 @@ void Scheduler::SwitchContext(Thread* new_thread) {
cpu_core->LoadContext(new_thread->context);
cpu_core->SetTlsAddress(new_thread->GetTLSAddress());
cpu_core->SetTPIDR_EL0(new_thread->GetTPIDR_EL0());
cpu_core->ClearExclusiveState();
} else {
current_thread = nullptr;

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@ -313,6 +313,7 @@ ResultVal<SharedPtr<Thread>> Thread::Create(std::string name, VAddr entry_point,
thread->status = THREADSTATUS_DORMANT;
thread->entry_point = entry_point;
thread->stack_top = stack_top;
thread->tpidr_el0 = 0;
thread->nominal_priority = thread->current_priority = priority;
thread->last_running_ticks = CoreTiming::GetTicks();
thread->processor_id = processor_id;

View file

@ -182,6 +182,14 @@ public:
return tls_address;
}
/*
* Returns the value of the TPIDR_EL0 Read/Write system register for this thread.
* @returns The value of the TPIDR_EL0 register.
*/
u64 GetTPIDR_EL0() const {
return tpidr_el0;
}
/*
* Returns the address of the current thread's command buffer, located in the TLS.
* @returns VAddr of the thread's command buffer.
@ -213,6 +221,7 @@ public:
s32 processor_id;
VAddr tls_address; ///< Virtual address of the Thread Local Storage of the thread
u64 tpidr_el0; ///< TPIDR_EL0 read/write system register.
SharedPtr<Process> owner_process; ///< Process that owns this thread